Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f1f803402c3a100cbcde712fd06581871463e9b8be326e26cdb66cb8a260a5' 
  AND token = 'CaOOEnuSGx9kN9HbV6B4NrsBc9TCfecTBHFzEsFV5Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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