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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '26fc2792a15297929966c9ecd677c9bda7a1abe551f308a23516b4b55402bae7' 
  AND token = 'wkfXT8vMW1Tdh6YuAubAc2DsE5rIYkPr88vLCAnvJtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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