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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '133e537094ba34e6b8feda85b63674afe0db515ff764b6b0ad1eca3c1817a8f7' 
  AND token = 'wptAD2LhDyPw1rJ7kRF8c6ksDATwRI/q9Qjd9jsNY3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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