Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17f5ea5cb22c6a8952ba814f2830b5c44ede4c9d90570b63fd187a99d5270a9' 
  AND token = '7+iCMO8JF9Rr8GoMyNZGlzBesyY62fp7Xng/R9fgcCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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