SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'acd191cf3f51b2fdc36be57e3bf84f67159d06314c02e92d52eb8309cbf169c1' 
  AND token = 'Gy/O6wNgfS47erAvZLfPzVGxSXQHyZapUNd6oVPCbBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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