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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34e9dc04c80b8a1aca004567b64cabf2be46c0efacc88f965628e50d3374a4d9' 
  AND token = 'P54bkUg+4ocZCPb74NSFVZ+voi07tsKtSCUSFl65oSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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