Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c0cbdac51844f358690ff7368e171731bb478e6823fe6a5c9b0ef9eb95c24e' 
  AND token = 'bdXJb4w/iDWL+ajymU7eVgwmNgo6Bn3LIbbCCo4+0Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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