Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88fc7a811816027b2c8eb934a3a31791b7a1b807937225dac1c3f09c6d59eb84' 
  AND token = 'BJ84cGNLhpM08tDfLrpwiYNpO1I+Awt1goNeMKsL74w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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