Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4186d87fbc8d22957deed093838283f791272986a521f367325c5728c2b194' 
  AND token = 'uEAl5aOmCkDvSim0o89lZ8DuZYQJtWZdzJ6L4BUQ0W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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