Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bce35a906cd66fc68513a320feae8e3498318facb62a83cef9dc576ff30eca' 
  AND token = 'yOc3QLtTuUHH00BoOJkWYh6WYJEXITONCzKn+Va+KOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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