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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd673329a5ce10c9210adb21e28efbb3e0b7c6feba3a5eb3e8083df54ef0b5ccd' 
  AND token = 'xqVr8hV9ukGqY9cqwKMaf+seDiycbGSuFdyOwcEopYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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