Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d27b0b05175cc5b13436d6bbf812ecf2f3d4437dacc5153ae31bd98d3d6d8f3' 
  AND token = 'rnqAd/SJaELWPEZWTQWZjVlxenVOWrJgrQbl+k4PO80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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