Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c8d2d240b8f1c61d490970c8dd33b239d43529f477469ee397c3c7e857c120' 
  AND token = 'zC8c4cuDKyREgL+FkfKLC21J1egS96FA0/7RhmkKmPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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