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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '24e2c669581fca3fd5839d41a2dd43a3a6ea71c8aceaf97811e45c5588e47412' 
  AND token = 'W0VmdstDdN6o89RSRpb8f094nVlMFmjz97gK06jqVmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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