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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bbb0ec170cb0bdabe76faa21a88876f015fafbd0975121ec3e153b4ea09983de' 
  AND token = 'MDbWCN3lvGDlziv82720RrzdFDd2c9Cs7MnsOXIonlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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