Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f96101175d3f6505aa7d169387ff930c616cb37f27e9dbe1314361af166e68' 
  AND token = 'FZ2PQ/3mV9SzEcmG+BNZUD655xCXLEJAVTWmB1E9WSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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