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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '119942bab377b2e928290e2f59081444b9679a71d5f852d5568e8d823788e2f5' 
  AND token = 'vN5nQutUkDrxETIkEKcAWybHgdwZgpT7L1D2A1Xr0oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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