Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3aea87ea2eb3f1d5c52b72bdeb9d32a78124f2f15dbdc4a5e77d0c410bde476' 
  AND token = 'axdj0scXoCQ8+eqEHmHl7j4oubH+8NAzax4RY+gnMOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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