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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9736f1482e8c89b92b3c38a553a9a2f06e490ef226cd27882919012e205dfe76' 
  AND token = 'mj9ThlyDZH4iFQkP9ZmJ6EYTf8y8Azcj5Qu76SAIP6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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