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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2976dedbe618a6b9ae2269c0b1b3604257fa1dde94316043535eac2e0a7c6d66' 
  AND token = '/ppmx3bYH8whE5W3Q0XvEkeIYilzbM12elaHlKdBisU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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