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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55e8fed68a7b4bd806ac3705ad588639755794e5392317860b1216e098cd017b' 
  AND token = 'bN0yf4KROGIxE8EUgKB9ZTv2mWCm4GaY1e6trrw7e7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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