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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4739dfbf4f4f34da098ac2b59b84d63fc0fa2e495e388f9dfc4b1e68d2257a9a' 
  AND token = 'G5Y7nmsppGia5+sAK3JkNOUl6cXMy3yBO7rf5R7o9wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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