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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '206cc87e4d5fad4ec481f69f69d8a6480c0fcff7d2b3a71ad2c848bbe48afa3e' 
  AND token = 'upKdtx9vn6CkYkShUjfirfeW2ZxJUR340qEOFezq4G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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