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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '421d043b237257b7f0ab71e527393b8e57f7cde6ad5924f63f213c661a899843' 
  AND token = 'h/7T2p1K1/iyDNaoXUYCconddtFu0tUMY4gCPHsM5Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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