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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02f51f8d9b488560b25d0d6f54c72c2745a5a6f81b5b4fc459c3ce5d76331ef3' 
  AND token = 'YYSHG6On8k30A4H1eTj/LVkg5abWufOC53Sp0HqQDYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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