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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79c359e7fa44cf15c924f17e4617434ef34e2aaf313a8df93ec71fbf2d2a5bc6' 
  AND token = '4dRmSrIPy9Zvk0ZW6I3r2RletzcJ6OtJ478bYj4r7j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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