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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dd79d27616e880ab836a656171ff7389f895fae1636bb56f1a317d29ab65c64a' 
  AND token = 'Ttc8ToteMkvgTKCMCZ07a97TzvcuDcYXbsXsnVgzBnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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