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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd1b85717205a71319667c6eb219ba1f194b3ed2f9b5aaf33ef8a5de90993bb0e' 
  AND token = 'eTW1eoTx4KhZ+iRvdtjcjpGq1nfHYIxnGNdm5c/A9e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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