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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'abdf9fe6faef4a043d4d2f9aef5c2c42cad34bc5c0c10cb346de4cceaa22802e' 
  AND token = 'aICWnOgafkIqEBVzmn/yksLqi/eFJJgDIhFPZHLQWMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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