Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55257bcd253f1c6fca0da73f1c16237b816214c7af698d8a8aff920b65a78bd' 
  AND token = 's15f52vD14e7AVmceHr/398ApWflygnoAFKPo5eCYKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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