Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0268ecf0f48befbb76879363c3a8d9cb3c2d03f0ccb8b4ce033f8506994538d7' 
  AND token = 'mK1fjqseOAOW6Q/j+Qdpj0s2qUtxZ9u3+eTX+0tDVIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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