Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d5b59fc8f0142b7588d4e38491c2677482110102edd5fdea6240fdfa14909c' 
  AND token = 'RM4Faa1FOteHOfiGTWPXhRXfQ2hQyAf1U07VqKHZqH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}