Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87863bbf25a2e517c09c79942014a7fb654bd21ec1c98f8b022fd6e2eab97a5' 
  AND token = 'ZQcE4r0YDCiAzFwJA06miPB1X5jNBNkYur+E3R7VAOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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