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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e8f8f1c21e2a6968bc27cdb16dbb8366c5a5a3675f09be64082fc6af52475efb' 
  AND token = '6d8Mr33bLoKPdtRl5U7JWyiVW9v4yCdUTD+QuXgtvx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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