SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d72fa36746ca78ce59bc3769f15f2c1ee62fa3b03e269740e9d4d9f161bdb72' 
  AND token = 'LfJmfFZufwoFxaR1EBpzflkSmEXToKWv5QHqOCpm90o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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