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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e13ef29db59a3fac393a4ea54c2da9fb862446137c99d6ee0b189e54dfb54ea' 
  AND token = 'HdNSZ9rHBChS1U6HcHq2xR7A/lh6VdJ6Yl3HyVPO6k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00317

JSON explain

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