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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3caacdd4cd37d5676e5188eba6e7fec8b940812fd4ad59ad891e777487f95444' 
  AND token = 'v27MTnUjdwBqrF2l6KeplfljWD3+aCB5NMqyR2Nin1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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