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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9b976b872510aea3d51abf1b5ce7f247e1aea6c1f303ae286ea762f462e62853' 
  AND token = 'ojphHDKBC5Z6IpcKl0XStOyoxsZLG0WNu3ZkMM0Gy0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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