Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7c1c0189e7aa7030aab0b3e36e73198a35fa167c8485052a7de77314a17948' 
  AND token = 'gOGcHEGD9ONGhieN3eOdALMUQimMoqcnY3RVjCuWRhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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