Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e54e7ebf57a6cb9e939092fe0522d6c6f00fa966166aad5c1aa05a1d971cc5' 
  AND token = 'WYU9HKA+2nnWwqCF9vTfRhQ2Fo9RoeW03D1+zMOHGtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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