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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f4c683f7634b518b9e7fb17acea904e889cb6cbe1e0b772c6e06a5815196763' 
  AND token = 'xRQTz3uAM5xXiEE8Cmn3beif5UShiNG8ctkSI2EtFio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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