Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8145b55f319a661904fefdfcb7fbac849ccee4b6a82615dea73126952e6643fd' 
  AND token = 'eTbcZLq6qs86CntwBvUCEKAbzyE59mtmU2JwdYlEKDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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