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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'adacf0c78a95f83325b4cee2a6a2642cbb08408da1c5b6cb7dc0fd7fc9ac2db3' 
  AND token = 'LsAdMH5KFcx1yTCNtvloEFs7xrD8VEM2XOqauuMA5n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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