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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a22b9cb8f5080e2029a76070c2ae0bf543d50b8e314866eb2f03be179ccfa235' 
  AND token = 'Epyl6HBqqJdJLC5HPxJjUaKd7lUMaHhcu6WtHJFuHQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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