Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4d1b94ff3370e0a2ef603c4138d7f0ecae6cf176a080faeb33ca8876b350d3' 
  AND token = '1xRY4VL316/zgCi7AkQwLySt+UjSsx+M2XKeDy70bc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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