Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe1bebc4d370ffdeaddd708e13a4b4d225fadd28e80a5833ed404debc57ef34' 
  AND token = '2mrEqmRsTYC6tzziGPR2ttXSlmveX1GtRx9Oe/TJxuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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