Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c152f5914f88096b1141e3dff6a5b6da582bd4aa2e2440f6075e57b6fbead325' 
  AND token = 's/SLv6X9jRbdSBUk8qurh4mQdcdlo/tlfJIzGnCXAcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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