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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f3e428e35ce6978da8c6abed6453cd3e4f9744a5c948f727a6b9f01fa57fbbb' 
  AND token = 'XELxT5PmXwg10idz03Ak9SJqcgA/nsJMg4PLuP6TkD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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