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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2ef99de425ba341fe9a5a7c710698164984a154c83fe4e6ad6ca25beb10b320f' 
  AND token = 'n2rcgYU6buS/PSfzxIxl/51xXqV1k9IWUapc0m17fwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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