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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0c226dbe836e518422d80fc250ab4cd287f100434dda79ad20ca45da9105534d' 
  AND token = 'f0vS4348kypjpZQcaNf/V9EL8sy/YcbbCxhzv5VPA9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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