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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2e7dc3bd5827a27b4b3174aa231bb2297d99038777af908d02ef048d2174c54f' 
  AND token = 'sVjdBZqE/yCME/3bsJnFIYbXTIDdSbO7uvUOaOFvXHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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