Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a35ab8457992ed06eeb40a4eb8783d39aadedf5ce16157eae0da7bf1c75c6a' 
  AND token = 'idIIj+8IIexSnWkQ9Ekg/Dieiecu5ihFFKs2sS/WgaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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