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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '893e4aedb4211d7ad2ea7cae347456c6f3e5e97458a3523b78e9b070c4224d05' 
  AND token = 'RBEPLmLrb4J/DOLowd7oRly4HeOtMM6BJOItv1vquY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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