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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd6bd01e8f88f76e84fee73a22606f08526dc43864633a75c387a5f278931e9ee' 
  AND token = 'Q4ivzD8B2eVMs5ngO7z2mzeRbZokOxurgRG+8/xiO1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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