Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6883ccfd0c068bfb4a60f3f637de7f88d2749ce7c12a3bd75c14561698dcd24' 
  AND token = 'YrMRHJRQYxMRRhFXzC4Pmx4eh0xH8M0JbB0E0dXPtzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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