Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb1343eef091e333d3e78c773a10b68a865bf537bdced392d53d61ff50e3c76' 
  AND token = 'fkOAXwP1fSA0ucmGO9TDxAN+QS51NWoK5KSi3urLZck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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