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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9eb4422538e4eb85baaf307d6ff6cca6f39ad98e885d7aeeb9d1dfdf2223b1c7' 
  AND token = 'x6RnA2PWs2MrFp2lj7OwG5C+fjk7oMzl/cW4NiZYQVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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