Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dde833de9563dfb25bb1460b536a122334d15328813dd1b4261b55184b01422' 
  AND token = '9gPjlLMspfV/nuFFMwlQJaOzl18jWBt4iaUnPIr+J0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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