Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21229bc8fab5a852e7f8d3ee7e3c36ec6e14fe61bf28f80d8ea5db77f86c89a1' 
  AND token = 'OSsWN7vSckVP8+ZD42KgkuVLd0Z2JSb4PqRLbTViOww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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