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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ea57eedbd863af554739ac17a03f39b3bfb5b78894eb9ced8613e269676399f' 
  AND token = '+XH338YRX6f4Zr7WtjB82a3M+t2pMYjLhP/oxluPSt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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