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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9c4a3fb7e549aef6c4a7486693d8d229bfcba9db3e48639a7cd6602576e727d7' 
  AND token = 'E2lnwCQz0KsxFN9TMI9DukiS10A8zOYuai3JiOneFFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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