Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fdffea2f0d697e3e833f3c51fa1b38bbe5b351392a07a987bb4a2d6b46d88d' 
  AND token = 'TNypXBuLMTFORWEnop9tCmKsNM+SaiTamUWAzfl9sR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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