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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c0c3074a03de399d0a1f163c7b4d542929cdc79abedb432a112c4ef91da4525' 
  AND token = '99H6oxSCR/KPxF67LP7Y0QRjO/cuioSLSk7XwpLPvCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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