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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '99df2b5ad94920676888b47ac48d046e4f3f931b094b9ad946335468f9202ce9' 
  AND token = 'WpFoOxzxhJImv+NlpCsDTld3DpamZVDfkm+NrRgcXz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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